2013-03-07 TyrUtils v0.6

* qbsp: respect floating point texture rotation and shift in map files
* qbsp: support for Valve's 220 map format used in later Worldcraft/Hammer
* qbsp: support func_group entities used by Radiant and similar editors
* qbsp: surfaces with the skip texture are now removed from the compiled bsp
* qbsp: hint brush support similar to Quake 2 for hand-tweaking the PVS
* qbsp: fixed a problem where leak files were not written for hull0 or hull1
* light: fixed a race condition in multithreaded coloured light processing
* light: fixed bug preventing use of all 4 light styles in a common case
* light: implemented attenutation formulae "delay" 4+5, ala Bengt's tools
* light: removed old bsp30 support
* light: lit files now automatically generated when coloured lights detected
* light: implemented 4x4 oversampling with -extra4 command line
* light: implemented the -gate option to help speed processing (default 0.001)
* light: implemented the "_softangle" key for spotlights
* light: implemented minlighting for brush models

2013-02-25 TyrUtils v0.5

* New changelog to summarise changes going forward
* light and vis both now multithreaded on Unix and Windows platforms
* vis now writes a state file every 5 minutes so it can resume if needed
* qbsp and vis now support a form of detail brushes, similar to Quake 2. See
  qbsp.txt for further details.
* added a small optimisation to vis for a minor speedup (usually only 1-2%)
* build system re-written and lots of cleanups all over the code
